Chelsea Green Publishing

Chelsea Green Blog

The World without Frogs: Climate Change and Pesticides May Lead to Extinction

See that little frog at the top of this post? Consider him the canary in the coal mine.

As humans continue burning coal, invading wetlands, and spraying herbicides like atrazine, we are throwing off the balance of predator, prey, and parasite in nature, beginning a chain reaction that could rapidly wipe out many species.

From Scientific American:

The northern leopard frogs that inhabit the boreal U.S. have never recovered from some catastrophic population declines in the 1970s. Some blame it on the acidifying lakes and streams caused by coal-burning, others point to the ongoing loss of wetlands to development, and now new evidence shows that the herbicide atrazine—widely sprayed on crop fields throughout the region—is killing the frogs by helping parasitic worms that feast on them.

“Atrazine provides a double whammy to frogs: It increases both amphibian exposure and susceptibility,” says biologist Jason Rohr of the University of South Florida in Tampa, who tested the impact by re-creating field conditions in 300-gallon (1,135-liter) tanks in his lab. “Atrazine is one of the more mobile and persistent pesticides being widely applied. In fact, residues have been found in remote, nonagricultural areas, such as the poles.”

That may explain why amphibians are on the decline worldwide. As many as one third of the nearly 6,000 known amphibian species—frogs, toads, salamanders, even wormlike caecilians—are threatened with extinction, according to the International Union for Conservation of Nature (IUCN). And no one knows why.

In the case of the northern leopards, the culprit appears to be the common herbicide acting as a double-edged sword: It suppresses the frogs’ immune systems while boosting the population of snails that play host to parasitic worm larvae, the latter of which infect the weakened leopard frogs.

Such herbicides are present in 57 percent of U.S. streams, according to the U.S. Geological Survey, and it is that water pollution—not inbreeding—that is the prime suspect in the high rate of deformity in U.S. amphibian populations, according to new research from Purdue University.

Read the whole article here.


Ask the Experts: Submit Your Permaculture Questions Now

Attention all growers, food-lovers, and green-living enthusiasts, we are once again celebrating Permaculture Month by putting our pioneering permaculture authors to work for you.Chelsea Green is proud to publish and distribute some of the most recognized, and award-winning, names in permaculture, and we’re making several of them available to our readers to answer any and all […] Read More

Recipe: Pascal Baudar’s Basic Wild Kimchi

Experiment with what you have, anything from the mustard family will work extremely well. Read More

Author Elizabeth Marshall Thomas: Dreaming of Lions

Reading through your life story, it’s clear that you were amazingly open to new experiences, approaching them like an observer who arrived with few previously held ideas. Do you think that it takes that kind of openness to see and understand animals and people in new ways, as you’ve done throughout your career? I do, […] Read More

Author Petra Kuenkel: The Art of Leading Collectively

More than ever before, there is a focus on new, collective forms of leadership—and an urgency to get collective change processes underway, all over the world. What’s behind the recent push to move collective leadership to the fore? Whether we find ourselves in societal or organizational change, it requires collective energy and drive to bring […] Read More

10 Books to Curl Up With This Winter

William Wordsworth was right when he said, “Nature never did betray the heart that loved her.” Nevertheless, the cold, dark days of winter can still get the best of even Nature’s most tenderhearted admirer. What’s one to do? We here at Chelsea Green have concocted the perfect cabin fever remedy with our suggested winter reading […] Read More
Follow us
Get every new post delivered to your inbox
Join millions of other followers
Powered By WPFruits.com